Underwater speaking chamber



FIG. 1 is a perspective view of an underwater speaking chamber showing my new design;

FIG. 2 is an elevational view thereof from the front;

FIG. 3 is an elevational view thereof from the rear;

FIG. 4 is an elevational view thereof from the left;

FIG. 5 is an elevational view thereof from the right;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 2, 3, 6, and 7 show interior hollow portions of the underwater speaking chamber that form no part of the claimed design. 

CLAIM The ornamental design for an underwater speaking chamber, as shown and described. 